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Old Plains, PA Weather Forecast
Old Plains, PA Weather Forecast Date: 626 AM EDT Mon Aug 17 2026
The area/counties/county of: Upper Bucks, including the cities of: Chalfont and Perkasie.or toggle through each period.
Today... Patchy fog this morning. Mostly cloudy with a slight chance of showers this morning, then partly sunny with a chance of showers with a slight chance of thunderstorms this afternoon. Warmer with highs in the mid 80s. Northwest winds around 5 mph. Chance of rain 40%.
Tonight... Mostly cloudy with a chance of showers and thunderstorms in the evening, then partly cloudy after midnight. Patchy fog. Humid with lows in the upper 60s. Northwest winds around 5 mph. Chance of rain 30%.
Tuesday... Patchy fog in the morning. Sunny with highs in the mid 80s. North winds around 5 mph.
Tuesday Night... Mostly clear. Lows in the mid 60s. Northwest winds around 5 mph in the evening, becoming light and variable.
Wednesday... Sunny, hot with highs in the mid 80s. West winds 5 to 10 mph.
Wednesday Night... Mostly clear in the evening, then becoming partly cloudy. Lows in the mid 60s.
Thursday... Partly sunny with a chance of showers. A chance of thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 50%.
Thursday Night... Mostly cloudy with a chance of showers and thunderstorms in the evening, then partly cloudy after midnight. Lows in the lower 60s. Chance of rain 50%.
Friday... Mostly sunny. A chance of showers in the afternoon. Highs in the lower 80s. Chance of rain 40%.
Friday Night... Mostly cloudy with a 50% chance of showers. Lows in the lower 60s.
Saturday... Mostly cloudy in the morning, then becoming partly sunny. A 50% chance of showers. Highs around 80.
Saturday Night... Mostly cloudy with a 50% chance of showers. Lows in the lower 60s.
POP = Probability of Precipitation
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